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172 lines
5.4 KiB
HTML
172 lines
5.4 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<title>Initialize an incremental deflate context</title>
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</head>
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<body class="docs"><div id="layout">
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<div id="layout-content"><div id="function.deflate-init" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">deflate_init</h1>
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<p class="verinfo">(PHP 7)</p><p class="refpurpose"><span class="refname">deflate_init</span> — <span class="dc-title">Initialize an incremental deflate context</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.deflate-init-description">
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<h3 class="title">说明</h3>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>deflate_init</strong></span>
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( <span class="methodparam"><span class="type">int</span> <code class="parameter">$encoding</code></span>
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[, <span class="methodparam"><span class="type">array</span> <code class="parameter">$options</code><span class="initializer"> = array()</span></span>
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] ) : <span class="type">resource</span></div>
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<p class="para rdfs-comment">
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Initializes an incremental deflate context using the specified
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<code class="parameter">encoding</code>.
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</p>
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<p class="para">
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Note that the <em>window</em> option here only sets the window size
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of the algorithm, differently from the zlib filters where the same parameter
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also sets the encoding to use; the encoding must be set with the
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<code class="parameter">encoding</code> parameter.
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</p>
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<p class="para">
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Limitation: there is currently no way to set the header information on a GZIP
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compressed stream, which are set as follows: GZIP signature
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(<em>\x1f\x8B</em>); compression method (<em>\x08</em>
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== DEFLATE); 6 zero bytes; the operating system set to the current system
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(<em>\x00</em> = Windows, <em>\x03</em> = Unix, etc.)
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.deflate-init-parameters">
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<h3 class="title">参数</h3>
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<dl>
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<dt>
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<code class="parameter">encoding</code></dt>
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<dd>
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<p class="para">
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One of the <strong><code>ZLIB_ENCODING_*</code></strong> constants.
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</p>
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</dd>
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<dt>
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<code class="parameter">options</code></dt>
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<dd>
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<p class="para">
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An associative array which may contain the following elements:
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<dl>
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<dt>
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<var class="varname"><var class="varname">level</var></var></dt>
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<dd>
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<p class="para">
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The compression level in range -1..9; defaults to -1.
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</p>
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</dd>
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<dt>
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<var class="varname"><var class="varname">memory</var></var></dt>
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<dd>
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<p class="para">
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The compression memory level in range 1..9; defaults to 8.
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</p>
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</dd>
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<dt>
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<var class="varname"><var class="varname">window</var></var></dt>
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<dd>
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<p class="para">
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The zlib window size (logarithmic) in range 8..15; defaults to 15.
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</p>
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</dd>
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<dt>
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<var class="varname"><var class="varname">strategy</var></var></dt>
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<dd>
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<p class="para">
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One of <strong><code>ZLIB_FILTERED</code></strong>,
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<strong><code>ZLIB_HUFFMAN_ONLY</code></strong>, <strong><code>ZLIB_RLE</code></strong>,
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<strong><code>ZLIB_FIXED</code></strong> or
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<strong><code>ZLIB_DEFAULT_STRATEGY</code></strong> (the default).
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</p>
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</dd>
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<dt>
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<var class="varname"><var class="varname">dictionary</var></var></dt>
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<dd>
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<p class="para">
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A <span class="type"><a href="language.types.string.html" class="type string">string</a></span> or an <span class="type"><a href="language.types.array.html" class="type array">array</a></span> of <span class="type"><span class="type strings">strings</span></span>
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of the preset dictionary (default: no preset dictionary).
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</p>
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</dd>
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</dl>
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</p>
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</dd>
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</dl>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.deflate-init-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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Returns a deflate context resource (<em>zlib.deflate</em>) on
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success, 或者在失败时返回 <strong><code>FALSE</code></strong>.
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</p>
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</div>
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<div class="refsect1 errors" id="refsect1-function.deflate-init-errors">
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<h3 class="title">错误／异常</h3>
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<p class="para">
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If an invalid option is passed to <code class="parameter">options</code> or the
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context couldn't be created, an error of level <strong><code>E_WARNING</code></strong>
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is generated.
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</p>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.deflate-init-seealso">
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<h3 class="title">参见</h3>
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<ul class="simplelist">
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<li class="member"><span class="function"><a href="deflate_add.html" class="function" rel="rdfs-seeAlso">deflate_add()</a> - Incrementally deflate data</span></li>
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<li class="member"><span class="function"><a href="inflate_init.html" class="function" rel="rdfs-seeAlso">inflate_init()</a> - Initialize an incremental inflate context</span></li>
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</ul>
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</div>
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</div></div></div></body></html> |